| abstract |
New compounds of the formula wherein R 'for NR 2 R 3 , an alkyl group, a mononuclear aryl group, a phenylalkylene group or a group of the formula stands, R 2 and R 3 each -H, -CHR 4 OR 5 , -CHR 4 -SR 6 -COOO or represent, wherein R 2 and R 'in formulas I and III are such that at most one is a group of formula III and at least two each represent a group -CHR 4 -SR 6 COOQ, R 4 and R 5 for -H or alkyl groups and R 6 represents an alkylene group which is optionally substituted by a carboxyl group, represents at least two Q in the formula IH and the remaining optional alkyl groups and m is 1, 2 or 3 and n is zero or 1, for example hexakis (N-2-carboxyethylthiomethyl) Melamine, a tris (N-2-carboxyethylthiomethyl) tris (Nn-butoxymethyl) melamine or tetrakis (N-2-carboxyethylthiomethyl) acetoguanamine are useful as hardeners for epoxy resins. |